In order to maintain the reach of a typical 100G WAN transport system(～1500 km)，several system improvements have to be made to r

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问题 In order to maintain the reach of a typical 100G WAN transport system(～1500 km)，several system improvements have to be made to recover the los(93)，including the use of low-loss low-nonlinearity(94)，Raman amplification，and stronger error correction．
(93)

选项 A、noise
B、SNR
C、speed
D、error

答案B

解析

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